<!-- from fixya rte -->Code po136 on 2002 subaru forester - 2002 Subaru Forester

Steve Allison

• 5569 Answers
• Posted on Oct 08, 2008

SOURCE: engine timing for a 1998 subaru forester with a 2.5

Since ignition timing is taken care of by the ECU, I guess you are asking about cam timing.
There are several marks to be aligned and if you get them wrong, you may trash your engine so I am only going to suggest you buy a Haynes service manual that has numerous good pix that show you exactly how to avoid killing your engine. And, unless you have a good-size vice well-mounted, compressing the belt tensioner again is going to give you fits.
The Haynes number you need is 89100 but it is listed only as a manual for the Legacy which uses the same engine but there may be less info that is usable on your '98 forester for which Haynes does not make a specific manual.
The later book that I have, 89101, covers all models from 2000 to 2006.  

SOURCE: subaru forester heater

take back to the dealer,hopefully the will find that the blend door cable is off or not adjusted properly

SOURCE: subaru forester 2001 has a slow acceleration.

how many mile is on the car it could have a bad muffler or possibly need a tune up

SOURCE: Subaru forester PO 171 code

Your fuel system is too lean. It's typically the primary O2 sensor (on the pipe between the engine and the catalytic converter). The mass airflow sensor is also possible but the O2 sensor is a wear item requiring periodic replacement and is more likely.

SOURCE: Subaru Forester 1999 GLS spark plug gap?

do the plugs yerself, on a turbo model they are awkward but worth saving your money. you need to take out the air box to do that side (off side in uk) get your plug socket 16mm, and fit it in to the plug (after you take off the leads!) then depending on length of your socket you may need an extention, i use the short swivel adaptor thingy!.. and slowly undo, ... gap to 0.7 - 0.8 on a turbo, 0.6 if your running high boost on a modded model, .............the other side (near side in uk) you got to take out the battery and the washer bottle, be careful with the pipework under the bottle and connections. .... there is not alot of room to change plugs on a 16valve subaru....so have a swear box and plasters ready lol....DO NOT OVERTIGHTEN!!!!!.... BECOMES A PROBLEM TO GET A BROKEN PLUG OUT ON THESE!...
I have just started a new club, www.forestercarclub.co.uk and www.forums.forestercarclub.co.uk ... based in uk, needs members to kick start, ask me any questions too. :) also have a page on google sites https://sites.google.com/site/subaruforesterdriverclub/